I'm seeing a lot terms like "friend zone," "benefits" and "grey area" thrown out. Just my two cents but if you're single shouldn't you be just enjoying the ride?
I've had feeling for girls who didn't share the same for me and vice versa its all part of the game. Far be it from me to speculate on what it takes to maintain something like a marriage but something I've learned over the years is to not worry about something that isn't even a commitment.